Infiniti QX56 (Z62). Manual - part 584

 

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Infiniti QX56 (Z62). Manual - part 584

 

 

EC-314

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0441 EVAP CONTROL SYSTEM

5.

Set voltmeter probes to ECM harness connector terminals under the following conditions.

6.

Check EVAP control system pressure sensor value at idle speed and note it.

7.

Establish and maintain the following conditions for at least 1 minute.

8.

Verify that EVAP control system pressure sensor value stays 0.1 V less than the value at idle speed (mea-
sured at step 6) for at least 1 second.

Is the inspection result normal?

YES

>> INSPECTION END

NO

>> Proceed to 

EC-314, "Diagnosis Procedure"

.

Diagnosis Procedure

INFOID:0000000006288306

1.

CHECK EVAP CANISTER

1.

Turn ignition switch OFF.

2.

Check EVAP canister for cracks.

Is the inspection result normal?

YES-1 >> With CONSULT-III: GO TO 2.
YES-2 >> Without CONSULT-III: GO TO 3.
NO

>> Replace EVAP canister. Refer to 

FL-12, "Removal and Installation"

.

2.

CHECK PURGE FLOW

 WITH CONSULT-III

1.

Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port.

2.

Start engine and let it idle.

3.

Select “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III.

4.

Touch “Qd” and “Qu” on CONSULT-III screen to adjust “PURG VOL CONT/V” opening and check vacuum
existence.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 4.

3.

CHECK PURGE FLOW

 WITHOUT CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Stop engine.

3.

Disconnect vacuum hose connected to EVAP canister purge volume control solenoid valve at EVAP ser-
vice port and install vacuum gauge. For the location of EVAP service port, refer to 

EC-45, "EVAPORATIVE

EMISSION SYSTEM : System Description"

.

ECM

Connector

+

Terminal

Terminal

E80

143

(EVAP control system pressure sensor signal)

150

Air conditioner switch

ON

Headlamp switch

ON

Rear window defogger switch

ON

Engine speed

Approx. 3,000 rpm

Gear position

Any position other than P, N or R

PURG VOL CONT/V

Vacuum

100%

Existed

0%

Not existed

P0441 EVAP CONTROL SYSTEM

EC-315

< DTC/CIRCUIT DIAGNOSIS >

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4.

Start engine and let it idle.
Never depress accelerator pedal even slightly.

5.

Check vacuum gauge indication before 60 seconds pass after starting engine.

6.

Rev engine up to 2,000 rpm after 100 seconds pass after starting engine.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 4.

4.

CHECK EVAP PURGE LINE

1.

Turn ignition switch OFF.

2.

Check EVAP purge line for improper connection or disconnection.
Refer to 

FL-10, "Hydraulic Layout"

.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Repair EVAP purge line.

5.

CHECK EVAP PURGE HOSE AND PURGE PORT

1.

Disconnect purge hoses connected to EVAP service port (A)
and EVAP canister purge volume control solenoid valve (B).

2.

Blow air into each hose and EVAP purge port (C).

3.

Check that air flows freely.

Is the inspection result normal?

YES-1 >> With CONSULT-III: GO TO 6.
YES-2 >> Without CONSULT-III: GO TO 7.
NO

>> Repair or clean hoses and/or purge port.

6.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

 WITH CONSULT-III

1.

Start engine.

2.

Perform “PURG VOL CONT/V” in “ACTIVE TEST” mode with CONSULT-III. Check that engine speed var-
ies according to the valve opening.

Does engine speed vary according to the valve opening?

YES

>> GO TO 8.

NO

>> GO TO 7.

7.

CHECK EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

Refer to 

EC-320, "Component Inspection (EVAP Canister Purge Volume Control Solenoid Valve)"

.

Is the inspection result normal?

Vacuum should not exist.

Vacuum should exist.

SEF367U

SEF368U

EC-316

< DTC/CIRCUIT DIAGNOSIS >

[VK56VD]

P0441 EVAP CONTROL SYSTEM

YES

>> GO TO 8.

NO

>> Replace EVAP canister purge volume control solenoid valve. Refer to 

FL-10, "Exploded View"

.

8.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR CONNECTOR

1.

Disconnect EVAP control system pressure sensor harness connector.

2.

Check that water is not inside connectors.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> Replace EVAP control system pressure sensor. Refer to 

FL-10, "Exploded View"

.

9.

CHECK EVAP CONTROL SYSTEM PRESSURE SENSOR FUNCTION

Refer to 

EC-336, "DTC Logic"

 for DTC P0452, 

EC-341, "DTC Logic"

 for DTC P0453.

Is the inspection result normal?

YES

>> GO TO 10.

NO

>> Replace EVAP control system pressure sensor.

10.

CHECK RUBBER TUBE FOR CLOGGING

1.

Disconnect rubber tube connected to EVAP canister vent control valve.

2.

Check the rubber tube for clogging.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> Clean the rubber tube using an air blower.

11.

CHECK EVAP CANISTER VENT CONTROL VALVE

Refer to 

EC-327, "Component Inspection (EVAP Canister Vent Control Valve)"

.

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> Replace EVAP canister vent control valve.

12.

CHECK EVAP PURGE LINE

Inspect EVAP purge line (pipe and rubber tube). Check for evidence of leaks.
Refer to 

FL-10, "Hydraulic Layout"

.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> Repair or replace malfunctioning part.

13.

CLEAN EVAP PURGE LINE

Clean EVAP purge line (pipe and rubber tube) using air blower.

>> GO TO 14.

14.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-40, "Intermittent Incident"

.

>> INSPECTION END

P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

EC-317

< DTC/CIRCUIT DIAGNOSIS >

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P0443 EVAP CANISTER PURGE VOLUME CONTROL SOLENOID VALVE

DTC Logic

INFOID:0000000006288307

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

3.

Turn ignition switch OFF and wait at least 10 seconds.

TESTING CONDITION:
• Perform “DTC CONFIRMATION PROCEDURE” when the fuel level is between 1/4 and 3/4 full, and

vehicle is placed on flat level surface.

• Always perform test at a temperature of 5 to 60

°

C (41 to 140

°

F).

• Cool the vehicle so that engine coolant temperature becomes same level as ambient temperature.
Do you have CONSULT-III

YES

>> GO TO 2.

NO

>> GO TO 4.

2.

PERFORM DTC CONFIRMATION PROCEDURE A

WITH CONSULT-III

1.

Turn ignition switch ON.

2.

Check that the following condition are met.
FUEL T/TMP SE: 0 - 35

°

C (32 - 95

°

F)

3.

Start engine and wait at least 60 seconds.

4.

Check 1st trip DTC.

IS 1st trip DTC detected?

OK

>> Proceed to 

EC-318, "Diagnosis Procedure"

.

NG

>> GO TO 3.

3.

PERFORM DTC CONFIRMATION PROCEDURE B

WITH CONSULT-III

1.

Start engine and warm it up to normal operating temperature.

2.

Turn ignition switch OFF and wait at least 10 seconds.

3.

Turn ignition switch ON.

4.

Turn ignition switch OFF and wait at least 10 seconds.

5.

Turn ignition switch ON.

6.

Select “PURG VOL CN/V P1444” of “EVAPORATIVE SYSTEM” in “DTC WORK SUPPORT” mode with
CONSULT-III.

7.

Touch “START”.

8.

Start engine and let it idle until “TESTING” on CONSULT-III changes to “COMPLETED”. (It will take
approximately 10 seconds.)
If “TESTING” is not displayed after 5 minutes, retry from step 2.

9.

Touch “SELF-DIAG RESULTS”.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P0443

PURG VOLUME CONT/V
(EVAP canister purge vol-
ume control solenoid valve)

A

The canister purge flow is detected dur-
ing the vehicle is stopped while the en-
gine is running, even when EVAP 
canister purge volume control solenoid 
valve is completely closed.

• EVAP control system pressure sensor
• EVAP canister purge volume control 

solenoid valve
(The valve is stuck open.)

• EVAP canister vent control valve
• EVAP canister
• Hoses

(Hoses are connected incorrectly or 
clogged.)

B

The canister purge flow is detected dur-
ing the specified driving conditions, even 
when EVAP canister purge volume con-
trol solenoid valve is completely closed.

 

 

 

 

 

 

 

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